Date: Thu, 04 Nov 1999 15:45:26 -0700 From: "Justin T. Gibbs" <gibbs@FreeBSD.org> To: Kelly Yancey <kbyanc@posi.net> Cc: Greg Lehey <grog@lemis.com>, Bernd Walter <ticso@cicely.de>, Mattias Pantzare <pantzer@ludd.luth.se>, freebsd-fs@FreeBSD.ORG Subject: Re: feature list journalled fs Message-ID: <199911042245.PAA05113@caspian.plutotech.com> In-Reply-To: Your message of "Thu, 04 Nov 1999 18:33:24 EST." <Pine.BSF.4.05.9911041822560.21761-100000@kronos.alcnet.com>
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>On Thu, 4 Nov 1999, Greg Lehey wrote: > >> >> That's for writing. When throughput becomes the limit, the write >> throughput of RAID-4 is limited to about 2 / n of the write throughput >> of RAID-5. On reading (randomly), it's (n - 1) / n. >> > > I think that it has been significantly proven that RAID 4 is not very >userful, and I regret bringing it up...sometimes the mind wonders :). It all depends on your application. If you are dealing with a data set composed of large, fixed sized entries, RAID 3 or 4 (they are almost identical) will always outperform RAID5. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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